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And update docs for the setting.

TBR=agrieve  # Mechanical rename

Bug: 1054892
Change-Id: I7303eb44046f70fae7e6c6a11c7aacc913ef8654
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107413
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751101}